The purpose of this study is to assess the safety, tolerability and efficacy of a new drug aimed at controlling disease activity in patients diagnosed with primary haemophagocytic lymphohistiocytosis. The new drug can be administered as the first-line therapy, to patients not previously treated with the current standard of care, or can be given to patients who have either failed or were unable to tolerate the current standard of care. Administration will be on top of a glucocorticosteroid, which is usually part of the current recommended treatment.

This is a 2-part, study to determine the safety, tolerability and pharmacokinetics of oral dabrafenib in children and adolescent subjects with advanced BRAF V600 mutation-positive solid tumors. Part 1 (dose escalation study) will identify the recommended Part 2 (tumor-specific expansion study) dose and regimen using a dose-escalation procedure. Approximately 6 to 18 subjects will participate in Part 1 and will receive a starting dose of 3 mg/kg and dose will deescalate or escalate between 1.5 milligram (mg)/kilogram (kg) and 6 mg/kg. Up to 6 subjects will be enrolled at one dose level dependent upon the number of subjects at the current dose level, the number of subjects who have experienced a dose limiting toxicity (DLT) at the current dose level, and the number of subjects enrolled but with data pending at the current dose level. Escalation may proceed until either a maximum tolerated dose (MTD) is established, or until the dose in which the median pharmacokinetic parameters consistent with exposure in adults are achieved. Cohorts may be added in order to evaluate additional dose levels. Part 2 consists of four disease-specific cohorts of subjects with tumors known to have BRAF V600 activation (pediatric low-grade gliomas, pediatric high-grade gliomas, Langerhans cell histiocytosis [LCH], and other tumors such as melanoma and papillary thyroid carcinoma [PTC]). Each cohort will enroll at least 10 subjects with a pre-dose and at least 1 post-dose disease assessment. In both the parts of the study, on Day 1, a single first dose will be administered, and repeat dosing will begin on Day 2. PK sampling will be performed on Day 1 and Day 15 for subjects >=25 kg in weight. For subjects <25 kg and >=10 kg in weight, blood samples for PK analysis will be collected on Day 1 and Day 15. For subjects <10kg in weight, blood samples for PK analysis will be collected after repeated administration on Day 15 only. Safety and tolerability will be assessed throughout the study. Treatment with dabrafenib will be continued until disease progression or until no clinical benefit or development of an unacceptable toxicity, or until they withdraw consent or begin a new therapy. At the end of treatment, a final study visit will occur.

This screening and multi-sub-study phase II trial studies how well treatment that is directed by genetic testing works in pediatric patients with solid tumors, non-Hodgkin lymphomas, or histiocytic disorders that have progressed following at least one line of standard systemic therapy and/or for which no standard treatment exists that has been shown to prolong survival. Genetic tests look at the unique genetic material (genes) of patients' tumor cells. Patients with genetic changes or abnormalities (mutations) may benefit more from treatment which targets their tumor's particular genetic mutation, and may help doctors plan better treatment for patients with solid tumors or non-Hodgkin lymphomas.

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